[patch 0/4] reiserfs xattr fixups

[patch 0/4] reiserfs xattr fixups

[Jeff Mahoney]

 Here are my remaining patches for reiserfs in 2.6.30:

 - reiserfs-xattr-fixup: Cleans up some ifdefs
 - reiserfs-xattr-root-fixup: Fixes an oops on open_xa_dir with
			      CONFIG_REISERFS_FS_XATTR=n
 - reiserfs-xattrs-disabled-perms: Fixes warnings on delete with
			      CONFIG_REISERFS_FS_XATTR=n (bko#13122)
 - reiserfs-expose-privroot: Adds a -oexpose_privroot that will allow
			     access to the privroot.

 Please apply.

 -Jeff

--
Jeff Mahoney
SUSE Labs

[patch 1/4] reiserfs: clean up ifdefs

[Jeff Mahoney]

[-- Attachment #1: reiserfs-xattr-fixup --]
[-- Type: text/plain, Size: 2873 bytes --]

 With xattr cleanup even with xattrs disabled, much of the initial setup
 is still performed. Some #ifdefs are just not needed since the options
 they protect wouldn't be available anyway.

 This patch cleans those up.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 fs/reiserfs/xattr.c |   49 ++++++++++++++++++++++++-------------------------
 1 file changed, 24 insertions(+), 25 deletions(-)

--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -685,20 +685,6 @@ out:
 	return err;
 }
 
-/* Actual operations that are exported to VFS-land */
-struct xattr_handler *reiserfs_xattr_handlers[] = {
-	&reiserfs_xattr_user_handler,
-	&reiserfs_xattr_trusted_handler,
-#ifdef CONFIG_REISERFS_FS_SECURITY
-	&reiserfs_xattr_security_handler,
-#endif
-#ifdef CONFIG_REISERFS_FS_POSIX_ACL
-	&reiserfs_posix_acl_access_handler,
-	&reiserfs_posix_acl_default_handler,
-#endif
-	NULL
-};
-
 /*
  * In order to implement different sets of xattr operations for each xattr
  * prefix with the generic xattr API, a filesystem should create a
@@ -922,6 +908,28 @@ static int create_privroot(struct dentry
 	return 0;
 }
 
+#else
+int __init reiserfs_xattr_register_handlers(void) { return 0; }
+void reiserfs_xattr_unregister_handlers(void) {}
+static int create_privroot(struct dentry *dentry) { return 0; }
+#endif
+
+/* Actual operations that are exported to VFS-land */
+struct xattr_handler *reiserfs_xattr_handlers[] = {
+#ifdef CONFIG_REISERFS_FS_XATTR
+	&reiserfs_xattr_user_handler,
+	&reiserfs_xattr_trusted_handler,
+#endif
+#ifdef CONFIG_REISERFS_FS_SECURITY
+	&reiserfs_xattr_security_handler,
+#endif
+#ifdef CONFIG_REISERFS_FS_POSIX_ACL
+	&reiserfs_posix_acl_access_handler,
+	&reiserfs_posix_acl_default_handler,
+#endif
+	NULL
+};
+
 static int xattr_mount_check(struct super_block *s)
 {
 	/* We need generation numbers to ensure that the oid mapping is correct
@@ -941,11 +949,6 @@ static int xattr_mount_check(struct supe
 	return 0;
 }
 
-#else
-int __init reiserfs_xattr_register_handlers(void) { return 0; }
-void reiserfs_xattr_unregister_handlers(void) {}
-#endif
-
 /* This will catch lookups from the fs root to .reiserfs_priv */
 static int
 xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name)
@@ -992,7 +995,6 @@ int reiserfs_xattr_init(struct super_blo
 	int err = 0;
 	struct dentry *privroot = REISERFS_SB(s)->priv_root;
 
-#ifdef CONFIG_REISERFS_FS_XATTR
 	err = xattr_mount_check(s);
 	if (err)
 		goto error;
@@ -1023,14 +1025,11 @@ error:
 		clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
 		clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
 	}
-#endif
 
 	/* The super_block MS_POSIXACL must mirror the (no)acl mount option. */
-#ifdef CONFIG_REISERFS_FS_POSIX_ACL
 	if (reiserfs_posixacl(s))
 		s->s_flags |= MS_POSIXACL;
 	else
-#endif
 		s->s_flags &= ~MS_POSIXACL;
 
 	return err;

[patch 2/4] [PATCH] reiserfs: deal with NULL xattr root w/ xattrs disabled

[Jeff Mahoney]

[-- Attachment #1: reiserfs-xattr-root-fixup --]
[-- Type: text/plain, Size: 1303 bytes --]

 This patch avoids an Oops in open_xa_root that can occur when deleting a
 file with xattrs disabled. It assumes that the xattr root will be there,
 and that is not guaranteed.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 fs/reiserfs/super.c |    2 --
 fs/reiserfs/xattr.c |    4 +++-
 2 files changed, 3 insertions(+), 3 deletions(-)

--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -448,13 +448,11 @@ int remove_save_link(struct inode *inode
 static void reiserfs_kill_sb(struct super_block *s)
 {
 	if (REISERFS_SB(s)) {
-#ifdef CONFIG_REISERFS_FS_XATTR
 		if (REISERFS_SB(s)->xattr_root) {
 			d_invalidate(REISERFS_SB(s)->xattr_root);
 			dput(REISERFS_SB(s)->xattr_root);
 			REISERFS_SB(s)->xattr_root = NULL;
 		}
-#endif
 		if (REISERFS_SB(s)->priv_root) {
 			d_invalidate(REISERFS_SB(s)->priv_root);
 			dput(REISERFS_SB(s)->priv_root);
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -123,7 +123,9 @@ static struct dentry *open_xa_root(struc
 	mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR);
 
 	xaroot = dget(REISERFS_SB(sb)->xattr_root);
-	if (!xaroot->d_inode) {
+	if (!xaroot)
+		xaroot = ERR_PTR(-ENODATA);
+	else if (!xaroot->d_inode) {
 		int err = -ENODATA;
 		if (xattr_may_create(flags))
 			err = xattr_mkdir(privroot->d_inode, xaroot, 0700);

[patch 3/4] reiserfs: fixup perms when xattrs are disabled

[Jeff Mahoney]

[-- Attachment #1: reiserfs-xattrs-disabled-perms --]
[-- Type: text/plain, Size: 2959 bytes --]

 This patch CONFIG_REISERFS_FS_XATTR protection from reiserfs_permission.

 This is needed to avoid warnings during file deletions and chowns with
 xattrs disabled.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
 fs/reiserfs/xattr.c            |   37 ++++++++++++++++++++-----------------
 include/linux/reiserfs_xattr.h |    4 +---
 2 files changed, 21 insertions(+), 20 deletions(-)

--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -869,23 +869,6 @@ static int reiserfs_check_acl(struct ino
 	return error;
 }
 
-int reiserfs_permission(struct inode *inode, int mask)
-{
-	/*
-	 * We don't do permission checks on the internal objects.
-	 * Permissions are determined by the "owning" object.
-	 */
-	if (IS_PRIVATE(inode))
-		return 0;
-	/*
-	 * Stat data v1 doesn't support ACLs.
-	 */
-	if (get_inode_sd_version(inode) == STAT_DATA_V1)
-		return generic_permission(inode, mask, NULL);
-	else
-		return generic_permission(inode, mask, reiserfs_check_acl);
-}
-
 static int create_privroot(struct dentry *dentry)
 {
 	int err;
@@ -949,6 +932,26 @@ static int xattr_mount_check(struct supe
 	return 0;
 }
 
+int reiserfs_permission(struct inode *inode, int mask)
+{
+	/*
+	 * We don't do permission checks on the internal objects.
+	 * Permissions are determined by the "owning" object.
+	 */
+	if (IS_PRIVATE(inode))
+		return 0;
+
+#ifdef CONFIG_REISERFS_FS_XATTR
+	/*
+	 * Stat data v1 doesn't support ACLs.
+	 */
+	if (get_inode_sd_version(inode) != STAT_DATA_V1)
+		return generic_permission(inode, mask, reiserfs_check_acl);
+	else
+#endif
+		return generic_permission(inode, mask, NULL);
+}
+
 /* This will catch lookups from the fs root to .reiserfs_priv */
 static int
 xattr_lookup_poison(struct dentry *dentry, struct qstr *q1, struct qstr *name)
--- a/include/linux/reiserfs_xattr.h
+++ b/include/linux/reiserfs_xattr.h
@@ -41,6 +41,7 @@ int reiserfs_xattr_init(struct super_blo
 int reiserfs_lookup_privroot(struct super_block *sb);
 int reiserfs_delete_xattrs(struct inode *inode);
 int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs);
+int reiserfs_permission(struct inode *inode, int mask);
 
 #ifdef CONFIG_REISERFS_FS_XATTR
 #define has_xattr_dir(inode) (REISERFS_I(inode)->i_flags & i_has_xattr_dir)
@@ -50,7 +51,6 @@ int reiserfs_setxattr(struct dentry *den
 		      const void *value, size_t size, int flags);
 ssize_t reiserfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 int reiserfs_removexattr(struct dentry *dentry, const char *name);
-int reiserfs_permission(struct inode *inode, int mask);
 
 int reiserfs_xattr_get(struct inode *, const char *, void *, size_t);
 int reiserfs_xattr_set(struct inode *, const char *, const void *, size_t, int);
@@ -117,8 +117,6 @@ static inline void reiserfs_init_xattr_r
 #define reiserfs_listxattr NULL
 #define reiserfs_removexattr NULL
 
-#define reiserfs_permission NULL
-
 static inline void reiserfs_init_xattr_rwsem(struct inode *inode)
 {
 }

[patch 4/4] reiserfs: allow exposing privroot w/ xattrs enabled

[Jeff Mahoney]

[-- Attachment #1: reiserfs-expose-privroot --]
[-- Type: text/plain, Size: 2936 bytes --]

This patch adds an -oexpose_privroot option to allow access to the privroot.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---

 fs/reiserfs/dir.c              |   10 ++++------
 fs/reiserfs/super.c            |    1 +
 fs/reiserfs/xattr.c            |    3 ++-
 include/linux/reiserfs_fs_sb.h |    2 ++
 4 files changed, 9 insertions(+), 7 deletions(-)

--- a/fs/reiserfs/dir.c
+++ b/fs/reiserfs/dir.c
@@ -44,13 +44,11 @@ static int reiserfs_dir_fsync(struct fil
 static inline bool is_privroot_deh(struct dentry *dir,
 				   struct reiserfs_de_head *deh)
 {
-	int ret = 0;
-#ifdef CONFIG_REISERFS_FS_XATTR
 	struct dentry *privroot = REISERFS_SB(dir->d_sb)->priv_root;
-	ret = (dir == dir->d_parent && privroot->d_inode &&
-	       deh->deh_objectid == INODE_PKEY(privroot->d_inode)->k_objectid);
-#endif
-	return ret;
+	if (reiserfs_expose_privroot(dir->d_sb))
+		return 0;
+	return (dir == dir->d_parent && privroot->d_inode &&
+	        deh->deh_objectid == INODE_PKEY(privroot->d_inode)->k_objectid);
 }
 
 int reiserfs_readdir_dentry(struct dentry *dentry, void *dirent,
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -898,6 +898,7 @@ static int reiserfs_parse_options(struct
 		{"conv",.setmask = 1 << REISERFS_CONVERT},
 		{"attrs",.setmask = 1 << REISERFS_ATTRS},
 		{"noattrs",.clrmask = 1 << REISERFS_ATTRS},
+		{"expose_privroot", .setmask = 1 << REISERFS_EXPOSE_PRIVROOT},
 #ifdef CONFIG_REISERFS_FS_XATTR
 		{"user_xattr",.setmask = 1 << REISERFS_XATTRS_USER},
 		{"nouser_xattr",.clrmask = 1 << REISERFS_XATTRS_USER},
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -982,7 +982,8 @@ int reiserfs_lookup_privroot(struct supe
 				strlen(PRIVROOT_NAME));
 	if (!IS_ERR(dentry)) {
 		REISERFS_SB(s)->priv_root = dentry;
-		s->s_root->d_op = &xattr_lookup_poison_ops;
+		if (!reiserfs_expose_privroot(s))
+			s->s_root->d_op = &xattr_lookup_poison_ops;
 		if (dentry->d_inode)
 			dentry->d_inode->i_flags |= S_PRIVATE;
 	} else
--- a/include/linux/reiserfs_fs_sb.h
+++ b/include/linux/reiserfs_fs_sb.h
@@ -453,6 +453,7 @@ enum reiserfs_mount_options {
 	REISERFS_ATTRS,
 	REISERFS_XATTRS_USER,
 	REISERFS_POSIXACL,
+	REISERFS_EXPOSE_PRIVROOT,
 	REISERFS_BARRIER_NONE,
 	REISERFS_BARRIER_FLUSH,
 
@@ -490,6 +491,7 @@ enum reiserfs_mount_options {
 #define reiserfs_data_writeback(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_DATA_WRITEBACK))
 #define reiserfs_xattrs_user(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_XATTRS_USER))
 #define reiserfs_posixacl(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_POSIXACL))
+#define reiserfs_expose_privroot(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_EXPOSE_PRIVROOT))
 #define reiserfs_xattrs_optional(s) (reiserfs_xattrs_user(s) || reiserfs_posixacl(s))
 #define reiserfs_barrier_none(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_BARRIER_NONE))
 #define reiserfs_barrier_flush(s) (REISERFS_SB(s)->s_mount_opt & (1 << REISERFS_BARRIER_FLUSH))

Re: [patch 0/4] reiserfs xattr fixups

[Stefan Richter]

Jeff Mahoney wrote:
>  Here are my remaining patches for reiserfs in 2.6.30:
> 
>  - reiserfs-xattr-fixup: Cleans up some ifdefs
>  - reiserfs-xattr-root-fixup: Fixes an oops on open_xa_dir with
> 			      CONFIG_REISERFS_FS_XATTR=n
>  - reiserfs-xattrs-disabled-perms: Fixes warnings on delete with
> 			      CONFIG_REISERFS_FS_XATTR=n (bko#13122)
>  - reiserfs-expose-privroot: Adds a -oexpose_privroot that will allow
> 			     access to the privroot.

I rebooted into v2.6.30-rc5-96-ga4d7749 + these four patches now.
Looks good so far.
-- 
Stefan Richter
-=====-=-=== -=-= -==-=
http://arcgraph.de/sr/

Re: [patch 3/4] reiserfs: fixup perms when xattrs are disabled

[Al Viro]

On Sun, May 10, 2009 at 04:05:38PM -0400, Jeff Mahoney wrote:

> +#ifdef CONFIG_REISERFS_FS_XATTR
> +	/*
> +	 * Stat data v1 doesn't support ACLs.
> +	 */
> +	if (get_inode_sd_version(inode) != STAT_DATA_V1)
> +		return generic_permission(inode, mask, reiserfs_check_acl);
> +	else
> +#endif
> +		return generic_permission(inode, mask, NULL);

Matter of style: this kind of mixing the nesting structures is Not Nice(tm),
so I'd rather turn that into

+#ifdef CONFIG_REISERFS_FS_XATTR
+	/*
+	 * Stat data v1 doesn't support ACLs.
+	 */
+	if (get_inode_sd_version(inode) != STAT_DATA_V1)
+		return generic_permission(inode, mask, reiserfs_check_acl);
+#endif
+
+	return generic_permission(inode, mask, NULL);

Re: [patch 3/4] reiserfs: fixup perms when xattrs are disabled

[Jeff Mahoney]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Al Viro wrote:
> On Sun, May 10, 2009 at 04:05:38PM -0400, Jeff Mahoney wrote:
> 
>> +#ifdef CONFIG_REISERFS_FS_XATTR
>> +	/*
>> +	 * Stat data v1 doesn't support ACLs.
>> +	 */
>> +	if (get_inode_sd_version(inode) != STAT_DATA_V1)
>> +		return generic_permission(inode, mask, reiserfs_check_acl);
>> +	else
>> +#endif
>> +		return generic_permission(inode, mask, NULL);
> 
> Matter of style: this kind of mixing the nesting structures is Not Nice(tm),
> so I'd rather turn that into
> 
> +#ifdef CONFIG_REISERFS_FS_XATTR
> +	/*
> +	 * Stat data v1 doesn't support ACLs.
> +	 */
> +	if (get_inode_sd_version(inode) != STAT_DATA_V1)
> +		return generic_permission(inode, mask, reiserfs_check_acl);
> +#endif
> +
> +	return generic_permission(inode, mask, NULL);

Works for me.

- -Jeff

- --
Jeff Mahoney
SUSE Labs
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